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Progress in Earth and Planetary Science
Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: Biotic and environmental changes in the Panthalassa Ocean across the Norian (Late Triassic) impact event

Fig. 4

Plots of SiO2 vs. Al2O3, K2O, and TiO2 for the chert and claystone samples. Chert (red open circles) and lower (blue open circles) and upper (blue filled circles) claystone samples exhibit negative correlations, indicating dilution with biogenic silica (e.g., radiolarians). TE terrigenous material in the Sakahogi section, UCC upper continental crust, PAAS post-Archean average Australian shale. Data sources: UCC (Rudnick and Gao 2014); PAAS (Taylor and McLennan 1985)

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